How to check flash wear via PowerShell within Windows 10

To check the wear value of an internal SSD drive via PowerShell within Windows 10, launch an elevated PowerShell session and use the following command.

Get-PhysicalDisk | Get-StorageReliabilityCounter | Select Wear

Not all drives accurately report this value to Windows. In some cases, the counter may be blank. Check with your manufacturer to see if they have proprietary tooling you can use to retrieve this value.

https://blogs.technet.microsoft.com/filecab/2017/08/11/understanding-dwpd-tbw/